Add all ingredients except egg and water to a large bowl.
Mix with a pastry cutter or fork until it looks like gravel.
In a separate bowl or liquid measuring cup, beat together the egg and water.
Add the egg mixture to the flour mixture, stirring with a fork. Form dough into a ball and wrap in plastic wrap.
Chill 15 minutes before rolling out. The dough can be left in the refrigerator for up to 3 days or it can be frozen until ready to use.
